Vim li cas nws tseem ceeb rau DNA replication kom raug?
Vim li cas nws tseem ceeb rau DNA replication kom raug?

Video: Vim li cas nws tseem ceeb rau DNA replication kom raug?

Video: Vim li cas nws tseem ceeb rau DNA replication kom raug?
Video: SLITHER.io (OPHIDIOPHOBIA SCOLECIPHOBIA NIGHTMARE) 2024, Kaum ib hlis
Anonim

Ua ntej lub cell yuav faib, nws yuav tsum yog replicate nws DNA kom txhua tus ntxhais ntawm tes tau txais ua tiav thiab yog lawm cov ntaub ntawv caj ces. DNA replication suav nrog cov txheej txheem proofreading uas pab kom ntseeg tau qhov tseeb.

Ntawm no, vim li cas nws thiaj tseem ceeb heev uas DNA replicates kom raug txhua zaus?

Kev piav qhia: DNA replication yuav tsum tau tshwm sim vim hais tias cov hlwb uas twb muaj lawm faib los tsim cov hlwb tshiab. Txhua cell xav tau phau ntawv qhia tag nrho los ua haujlwm kom raug . Yog li tus DNA yuav tsum tau theej ua ntej kev faib cell yog li ntawd uas txhua cell tshiab tau txais cov lus qhia tag nrho!

Tom qab ntawd, lo lus nug yog, vim li cas DNA replication tseem ceeb rau txhua yam muaj sia? Kev piav qhia: DNA replication yog ib qho tseem ceeb hauv tag nrho cov kab mob tiv thaiv cov meiosis thiab mitosis los ntawm kev tua cov hlwb. Yog DNA replication ua tiav, cov txheej txheem tuaj yeem nres ntawm qhov tshwm sim. Cov DNA doubles nws tus kheej kom muaj nuj nqis ntawm cov hlwb sib cais thaum lub sij hawm mitosis los yog meiosis.

Kuj nug, vim li cas nws tseem ceeb rau DNA replication tshwm sim yam tsis muaj qhov yuam kev?

- Txhawm rau tiv thaiv kev hloov pauv thiab khaws cov kab mob hauv ib noj qab nyob zoo lub xeev. Kev piav qhia: DNA replication koom nrog synthesis ntawm tus ntxhais DNA molecules los ntawm siv niam txiv DNA raws li tus qauv. Cov cell muaj ntau txoj hauv kev mus yuam kev dawb rov ua dua , yog li ntawd, DNA replication qhia ib txheej txheem raug heev.

Yuav ua li cas yog tias DNA tsis rov ua dua?

S theem cyclins tswj kev nce qib ntawm lub voj voog ntawm tes thaum lub sijhawm DNA replication . Yog ib cell tsis muaj kom luam nws cov chromosomes los yog muaj yog kev puas tsuaj rau DNA , CDK yuav tsis yog qhib lub S theem cyclin thiab lub cell yuav tsis yog nce mus rau theem G2.

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